Middle Stone Age Shell Beads from South Africa

@article{Henshilwood2004MiddleSA,
  title={Middle Stone Age Shell Beads from South Africa},
  author={Christopher S. Henshilwood and Francesco d’Errico and Marian Vanhaeren and Karen L. van Niekerk and Zenobia Jacobs},
  journal={Science},
  year={2004},
  volume={304},
  pages={404 - 404}
}
There are two competing models for the emergence of modern human behavior: first, a late emergence in Africa or Eurasia at ∼50 to 40 thousand years ago (ka), and second, a gradual transition in Africa between 250 to 50 ka ([ 1 ][1]). In both models, personal ornaments and art are unquestioned 
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